무게중심:x1,y1),(x2,y2),(x3,y3)이라하면무게중심G1는정의에따라G1=G1((x1+x2+x3)/3,(y1+y2+y3)/3)이됩니다/내심:|AB|C+|BC|A+|CA|B,|AB|+|BC|+|CA|(단,|AB
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